Biology Chemical Coordination NUMS 2024
PMDC Verified Question 9 of 50
Which of the following is an example of negative feedback mechanism?
A
Control of body temperature
B
Aggregation of platelets during wound healing
C
Labor contraction
D
Milk secretion during suckling
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Control of body temperature
Concept:

Biological negative feedback serves to maintain homeostasis by reversing any deviation from an ideal set-point.

Solution:

  • If a person steps into a freezing environment, core temperature drops. The hypothalamus detects this and triggers shivering to generate heat.


  • Once the body warms back up to 37\(^\circ\)C, the shivering stops. Because the response (heat) turned off the initial stimulus (cold), the control of body temperature is a perfect negative feedback loop.


Why other options are incorrect:

Platelet aggregation, labor contractions, and milk let-down are all classic examples of positive feedback, where the body amplifies the response until a final event occurs.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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